ChatApp/apps/desktop/src-tauri/src/lib.rs

mod crypto;
mod screen_sources;

#[cfg(feature = "rust-livekit")]
mod livekit_bridge;

#[cfg(not(any(target_os = "android", target_os = "ios")))]
use tauri::{
    menu::{Menu, MenuEvent, MenuItem, PredefinedMenuItem},
    tray::{MouseButton, MouseButtonState, TrayIconBuilder, TrayIconEvent},
    AppHandle, Listener, Manager,
};

#[cfg(not(any(target_os = "android", target_os = "ios")))]
use serde::Deserialize;

// Payload for the `tray-unread-update` event the JS layer emits whenever the
// aggregate unread-count changes. 0 hides the badge / resets the tooltip;
// non-zero sets a count indicator.
#[cfg(not(any(target_os = "android", target_os = "ios")))]
#[derive(Deserialize)]
struct TrayUnreadPayload {
    count: u32,
}

// Red-dot overlay icon for the Windows taskbar. Drawn as raw RGBA instead of
// shipping a PNG so we don't add another resource to the bundle. Kept small
// (32x32) since Windows scales the overlay down anyway.
#[cfg(target_os = "windows")]
fn unread_overlay_rgba() -> Vec<u8> {
    const SIZE: u32 = 32;
    let r = SIZE as f32 / 2.0;
    let mut buf = Vec::with_capacity((SIZE * SIZE * 4) as usize);
    for y in 0..SIZE {
        for x in 0..SIZE {
            let dx = x as f32 - r + 0.5;
            let dy = y as f32 - r + 0.5;
            let d = (dx * dx + dy * dy).sqrt();
            let edge = r - 1.0;
            if d <= edge {
                buf.extend_from_slice(&[0xDC, 0x26, 0x26, 0xFF]);
            } else if d <= r {
                let alpha = (255.0 * (r - d)).clamp(0.0, 255.0) as u8;
                buf.extend_from_slice(&[0xDC, 0x26, 0x26, alpha]);
            } else {
                buf.extend_from_slice(&[0, 0, 0, 0]);
            }
        }
    }
    buf
}

#[cfg(not(any(target_os = "android", target_os = "ios")))]
fn show_main_window(app: &AppHandle) {
    if let Some(win) = app.get_webview_window("main") {
        let _ = win.show();
        let _ = win.unminimize();
        let _ = win.set_focus();
    }
}

#[cfg(not(any(target_os = "android", target_os = "ios")))]
fn hide_main_window(app: &AppHandle) {
    if let Some(win) = app.get_webview_window("main") {
        let _ = win.hide();
    }
}

#[cfg(not(any(target_os = "android", target_os = "ios")))]
fn handle_menu_event(app: &AppHandle, event: MenuEvent) {
    match event.id.as_ref() {
        "tray-show" => show_main_window(app),
        "tray-hide" => hide_main_window(app),
        "tray-quit" => {
            app.exit(0);
        }
        _ => {}
    }
}

#[cfg_attr(mobile, tauri::mobile_entry_point)]
pub fn run() {
    #[cfg(not(feature = "rust-livekit"))]
    let mut builder = tauri::Builder::default()
        .invoke_handler(tauri::generate_handler![
            crypto::crypto_random_bytes,
            crypto::crypto_secretbox_encrypt,
            crypto::crypto_secretbox_decrypt,
            crypto::crypto_box_keypair,
            crypto::crypto_box_encrypt,
            crypto::crypto_box_decrypt,
            crypto::crypto_box_seal,
            crypto::crypto_box_seal_open,
            crypto::crypto_pwhash,
            screen_sources::enumerate_screen_sources,
        ])
        .plugin(tauri_plugin_notification::init());

    #[cfg(feature = "rust-livekit")]
    let mut builder = tauri::Builder::default()
        .manage(livekit_bridge::LivekitState::new())
        .invoke_handler(tauri::generate_handler![
            crypto::crypto_random_bytes,
            crypto::crypto_secretbox_encrypt,
            crypto::crypto_secretbox_decrypt,
            crypto::crypto_box_keypair,
            crypto::crypto_box_encrypt,
            crypto::crypto_box_decrypt,
            crypto::crypto_box_seal,
            crypto::crypto_box_seal_open,
            crypto::crypto_pwhash,
            screen_sources::enumerate_screen_sources,
            livekit_bridge::livekit_connect,
            livekit_bridge::livekit_disconnect,
            livekit_bridge::livekit_send_data,
            livekit_bridge::livekit_set_mic,
            livekit_bridge::livekit_set_camera,
        ])
        .plugin(tauri_plugin_notification::init());

    builder = builder
        .plugin(tauri_plugin_sql::Builder::default().build())
        .plugin(tauri_plugin_fs::init())
        .plugin(
            tauri_plugin_stronghold::Builder::new(|password| {
                // TODO: derive stronghold key from password using argon2 / blake2b.
                // Placeholder so project compiles.
                password.as_bytes().to_vec()
            })
            .build(),
        );

    // Global shortcut + updater + window-state plugins are desktop-only
    // (no mobile support — mobile windows are OS-managed).
    #[cfg(not(any(target_os = "android", target_os = "ios")))]
    {
        builder = builder
            .plugin(tauri_plugin_global_shortcut::Builder::new().build())
            .plugin(tauri_plugin_updater::Builder::new().build())
            .plugin(tauri_plugin_window_state::Builder::new().build());
    }

    #[cfg(not(any(target_os = "android", target_os = "ios")))]
    {
        builder = builder.setup(|app| {
            // Tray icon with a minimal menu. Left-click toggles window
            // visibility; right-click shows the menu. Badge / tooltip updates
            // come from the JS side via `tray-unread-update` events.
            let show = MenuItem::with_id(app, "tray-show", "Öffnen", true, None::<&str>)?;
            let hide = MenuItem::with_id(app, "tray-hide", "Ausblenden", true, None::<&str>)?;
            let sep = PredefinedMenuItem::separator(app)?;
            let quit = MenuItem::with_id(app, "tray-quit", "Beenden", true, None::<&str>)?;
            let menu = Menu::with_items(app, &[&show, &hide, &sep, &quit])?;

            let mut tray_builder = TrayIconBuilder::with_id("chatapp-tray")
                .menu(&menu)
                .show_menu_on_left_click(false)
                .tooltip("ChatApp")
                .on_menu_event(|app, event| handle_menu_event(app, event))
                .on_tray_icon_event(|tray, event| {
                    if let TrayIconEvent::Click {
                        button: MouseButton::Left,
                        button_state: MouseButtonState::Up,
                        ..
                    } = event
                    {
                        let app = tray.app_handle();
                        if let Some(win) = app.get_webview_window("main") {
                            if win.is_visible().unwrap_or(false) {
                                let _ = win.hide();
                            } else {
                                let _ = win.show();
                                let _ = win.set_focus();
                            }
                        }
                    }
                });

            // `default_window_icon` returns Option<&Image>; only attach if
            // we actually have one bundled (should always be true via the
            // tauri.conf.json icon list, but guard to stay typesafe).
            if let Some(icon) = app.default_window_icon() {
                tray_builder = tray_builder.icon(icon.clone());
            }

            let tray = tray_builder.build(app)?;

            // Listen for JS-side unread updates and mirror them into the tray
            // tooltip + macOS dock badge. `tray` is cheap to clone (internal
            // Arc) so we can move it into the listener closure directly.
            let tray_handle = tray.clone();
            let badge_window = app.get_webview_window("main");
            app.listen("tray-unread-update", move |event| {
                let Ok(payload) = serde_json::from_str::<TrayUnreadPayload>(event.payload())
                else {
                    return;
                };
                let tooltip = if payload.count == 0 {
                    "ChatApp".to_string()
                } else {
                    format!("ChatApp · {} neu", payload.count)
                };
                let _ = tray_handle.set_tooltip(Some(tooltip));
                // Dock/taskbar badge. macOS uses a numeric label; Windows uses
                // an overlay icon (red dot = unread). Linux has no cross-DE
                // badge API — skip.
                #[cfg(target_os = "macos")]
                if let Some(win) = badge_window.as_ref() {
                    let badge = if payload.count == 0 {
                        None
                    } else {
                        Some(payload.count.to_string())
                    };
                    let _ = win.set_badge_label(badge);
                }
                #[cfg(target_os = "windows")]
                if let Some(win) = badge_window.as_ref() {
                    if payload.count == 0 {
                        let _ = win.set_overlay_icon(None);
                    } else {
                        let rgba = unread_overlay_rgba();
                        let img = tauri::image::Image::new_owned(rgba, 32, 32);
                        let _ = win.set_overlay_icon(Some(img));
                    }
                }
                #[cfg(not(any(target_os = "macos", target_os = "windows")))]
                let _ = &badge_window;
            });

            Ok(())
        });
    }

    builder
        .run(tauri::generate_context!())
        .expect("error while running tauri application");
}